Late Quaternary paleosol–sediment-sequences and landscape evolution along the Andean piedmont, Bolivian Chaco

May, Jan-Hendrik; Zech, Roland; Veit, Heinz

doi:10.1016/j.geomorph.2007.02.025

Cited by 37 publications

(38 citation statements)

References 63 publications

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“…Mudanças similares foram reconhecidas a oeste, nas planícies orientais da Bolivia, onde May et al (2008) destacaram a existência de paisagem produzida na transição Pleistoceno/Holoceno por aumento na descarga fl uvial, na erosão dos solos e no aporte sedimentar. Na mesma linha, Latrubesse et al (2012) (Figura 6-B).…”

Section: Discussão Dos Resultadosunclassified

Mudanças Paleo-Hidrológicas Na Planície Do Rio Paraguai, Quaternário Do Pantanal

Macedo

Assine

Pupim

et al. 2014

Rev. Bras. Geomorfol.

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O Paraguai é o rio-tronco do trato de sistemas deposicionais do Pantanal. Com base em dados de sensores remotos e verificação de campo, foi realizado mapeamento geomorfológico da planície do rio Paraguai no trecho entre as confluências dos rios Cuiabá e Miranda, onde foram reconhecidas formas deposicionais atuais e antigas. A análise das associações de formas permitiu estabelecer proposta de evolução geomorfológica para a área, mas os eventos carecem ainda de datação precisa por métodos geocronológicos. Uma rede de drenagem abandonada multicanais está parcialmente preservada na planície, sendo composta por formas de canais com diques marginais que evidenciam período de menor descarga fluvial, provavelmente do Pleistoceno tardio ao Holoceno inferior. Um sistema constituído por paleocinturões de meandros trunca a paleorrede de drenagem multicanais, registrando aumento na umidade e na descarga fluvial. Sob essas condições o rio Paraguai construiu um sistema composto por cinturões de meandros com direção aproximada norte-sul no Holoceno inferior/médio. Agradação dos cinturões favoreceu importante evento de avulsão, com a mudança do curso do rio Paraguai para o cinturão de meandros atual no Holoceno superior. As gerações de formas identificadas e mapeadas resultaram num padrão de sobreposição de diferentes estilos fluviais, que registram significativas mudanças hidrológicas na planície desde o Pleistoceno tardio.

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Section: Discussão Dos Resultadosunclassified

Mudanças Paleo-Hidrológicas Na Planície Do Rio Paraguai, Quaternário Do Pantanal

Macedo

Assine

Pupim

et al. 2014

Rev. Bras. Geomorfol.

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“…4 -12.4 cal ka BP (Argollo and Mourguiart, 2000), 18 -11 ka (Placzek et al, 2006) or 13 -11.5 cal ka BP (Baker et al, 2001b) on the Altiplano, and from 12.8 cal ka BP in the Pantanal (Whitney et al, 2011) indicate increased humidity due to strengthening of the SASM (Baker et al, 2001b). At the transition to the Holocene seasonality may have decreased and winter precipitation increased as interpreted from wetland formation in the Andes and its foreland (May et al, 2008;Servant and Servant-Vildary, 2003).…”

Section: The Late Quaternary Fluvial System In the Llanos De Moxos Anmentioning

confidence: 99%

Geomorphology and evolution of the late Pleistocene to Holocene fluvial system in the south-eastern Llanos de Moxos, Bolivian Amazon

Plotzki¹,

May²,

Preusser³

et al. 2015

CATENA

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In the Bolivian Amazon several paleochannel generations are preserved. Their wide spectrum of morphologies clearly provides crucial information on the type and magnitude of geomorphic and hydrological changes within the drainage network of the Andean foreland. Therefore, in this study we mapped geomorphological characteristics of paleochannels, and applied radiocarbon and optically stimulated luminescence dating. Seven paleochannel generations are identified. Significant changes in sinuosity, channel widths and river pattern are observed for the successive paleochannel generations. Our results clearly reflect at least three different geomorphic and hydrological periods in the evolution of the fluvial system since the late Pleistocene. Changes in discharge and sediment load may be controlled by combinations of two interrelated mechanisms: (i) spatial changes and re-organizations of the drainage network in the upper catchment, and/or (ii) climate changes with their associated local to catchment-scale modifications in vegetation cover, and changes in discharge, inundation frequencies and magnitudes, which have likely affected the evolution of the fluvial system in the Llanos de Moxos. In summary, our study has revealed the enormous potential which geomorphic mapping and analysis combined with luminescence based chronologies hold for the reconstruction of the late Pleistocene to recent fluvial system in a large portion of Amazonia. AbstractIn the Bolivian Amazon several paleochannel generations are preserved. Their wide spectrum of morphologies clearly provides crucial information on the type and magnitude of geomorphic and hydrological changes within the drainage network of the Andean foreland.Therefore, in this study we mapped geomorphological characteristics of paleochannels, and applied radiocarbon and optically stimulated luminescence dating. Seven paleochannel generations are identified. Significant changes in sinuosity, channel widths and river pattern are observed for the successive paleochannel generations. Our results clearly reflect at least three different geomorphic and hydrological periods in the evolution of the fluvial system since the late Pleistocene. Changes in discharge and sediment load may be controlled by combinations of two interrelated mechanisms: (i) spatial changes and re-organizations of the drainage network in the upper catchment, and/or (ii) climate changes with their associated local to catchment-scale modifications in vegetation cover, and changes in discharge, inundation frequencies and magnitudes, which have likely affected the evolution of the fluvial 2 system in the Llanos de Moxos. In summary, our study has revealed the enormous potential which geomorphic mapping and analysis combined with luminescence based chronologies hold for the reconstruction of the late Pleistocene to recent fluvial system in a large portion of Amazonia.

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“…The distance from the levee crevasse, which determines the energy of this microenvironment and its erosive power (Stouthamer, 2001), may result in the burying of soils, characterizing paleosols (May et al, 2008), as suggested by the evidence found in this study. Thus, this characteristic, as observed in AP1, AP4 and AP10, may be used as basis for studies on paleoreconstruction and paleoclimate of the Quaternary (May & Veit, 2009), given that depositional environments are natural systems that react to changes of environmental variables in an attempt to return to balance conditions (Burkett & Kusler, 2000;Winter, 2000).…”

Section: Discussionmentioning

confidence: 57%

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

Nascimento

Furquim

Couto

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYThe Pantanal region can be characterized as a quaternary floodplain with predominant sedimentation in the form of alluvial fans. In the geomorphologic and sedimentary evolution, the avulsion process is inherent to this depositional system and its dynamics, together with surface water floods, influence soil sedimentation on this plain. The knowledge and differentiation of these two events can contribute to a better understanding of the variability of soil properties and distribution under the influence of these sedimentation processes. Therefore, this study investigated the genesis of soils in the Northern Pantanal with textural contrasts in deeper horizons and their relationship with the depositional system dynamics. We analyzed four soil profiles in the region of Barão de Melgaço, Mato Grosso State, Brazil (RPPN SESC Pantanal). Two profiles were sampled near the Rio Cuiabá (AP1 and AP4) and two near the Rio São Lourenço (AP10 and AP11). In AP11, the horizons contrast in particle size between the profile basis and the surface. In AP1, AP4 and AP10, the horizons overlaying the sand layer have similar particle size properties, mainly in terms of sand distribution. In the first case, floods (surface water) seem to have originated the horizons and layers with contrasting texture. In the second case, avulsion is the most pronounced process. Therefore, the two modes can form soils with contrasting texture that are discriminable by soil morphology, based on the distinct features associated to the specific sedimentation processes.Index terms: alluvial soils, hydromorphic soils, fluvial deposition system, alluvial fans, avulsion.(

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Late Quaternary paleosol–sediment-sequences and landscape evolution along the Andean piedmont, Bolivian Chaco

Cited by 37 publications

References 63 publications

Mudanças Paleo-Hidrológicas Na Planície Do Rio Paraguai, Quaternário Do Pantanal

Mudanças Paleo-Hidrológicas Na Planície Do Rio Paraguai, Quaternário Do Pantanal

Geomorphology and evolution of the late Pleistocene to Holocene fluvial system in the south-eastern Llanos de Moxos, Bolivian Amazon

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

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